Abrading machine



Oct. 10, TEBBE ABRADING MACHINE Filed Dec. 16, 1929 v 3 Sheets-Sheet 1 I N VEN TOR.

A TTORNEYJ Oct. 10, 1933. F. TEBBE 1,929,960

ABRADING MACHINE Filed Dec. 16, 1929 3 Sheets-Sheet 2 I N VENTOR.

'88 A TTORNEYA:

Oct. 10, 1933.

F. TEBBE ABRADING MACHINE Filed Dec. 16, 1929 3 Sheets-Sheet 3 A TTORNEYJ,

Patented Oct. 10, 1933 i'JNiTED STATES PATENT @FFECE Application December 16, 1929 Serial No. 414,476

9 Claims.

My invention relates to abrading machines, and particularly to sanding machines of the rotating disc type.

It is the object of my invention to provide a sanding machine of the disc type in which there is a fixed table to support work, and in which the motor and sanding disc are so mounted as to have the plane of the sanding disc adjustable to various angular positions relative to the plane of the table. In such a combination it is further my object to provide an adjustable gauge which will accommodate itself to adjustments relative to the sanding disc regardless of the angle at which the disc is set. Another object is the provision of an extremely convenient mechanical combination of elements for adjusting the angle of the sanding disc.

I have as a further object the provision of a novel guard for a sanding machine and an improved arrangement for the removal by suction of dust arising due to the operation of the sander. Another object is the provision of a novel type of suction fan and its installation in such manner as to very effectively remove all dust. A still further object is the provision of a novel resistance or dust guard plate which will prevent the sanding disc from forming a suction counter to that of the fan.

The above and other objects, such as cheapness of construction and other mechanical improvements, I accomplish by that certain combination and arrangement of parts of which I have illustrated a preferred embodiment.

In the drawings:

Figure 1 is a perspective view of the sanding machine unit.

Figure 2 is a perspective view of the fan casing and guard plate.

Figure 3 is a perspective View of the calibrated gauge plate.

Figure 4 is a perspective view of the combination of motor, fan and arcuate guide rods.

Figure 5 is a perspective view of the base of the sander with the motor disc and table removed.

Figure 6 is a front elevation of the sander disc and cover plate.

Figure '7 is a perspective view of a preferred type of standard of column for the mounting of the sanding unit at a desired elevation above the floor.

Figure 8 is a front elevation of a preferred type of suction fan.

Figure 9 is a side elevation of a preferred type of table gauge.

Figure 10 is a fragmentary sectional view through the sander disc, resistance plate, felt pad and actuating shaft.

Figure 11 is a front elevation of the resistance or dust guard plate. V

Figure 12 is a plan view of the angle gauge f0! the work table, which is shown in side elevation in Figure 9.

Figure 13 is a perspective view of a modified type of motor support.

Figure 1a is a perspective View of a modified type of motor mountin plate.

I have indicated the sanding machine supporting base at 1 having bosses 2 which serve as supports, either to mount the machine on a table, or on a suitable column, such as is indicated at 3'0 3. The column 3 has bosses l with apertures 5 therein arranged to register with the apertures 6 in the bosses 2, so that mounting bolts may be employed to secure the sanding machine unit on the column.

1 An operating spindle 7 having a hand wheel 8 is preferably employed to rotate the pinion 9, the particular gear ratio employed being in accordance with whatever adjustment speed is desired. The frame 1 has arcuate guide rails 10.

On arcuate segments 11 which form a support for the motor and fan assembly, arcuate ledges 12 are provided which engage the grooves 13 in guiding elements to be hereinafter described. Rotation of the hand wheel 8 causes the pinion 9 to actuate the gear sectors l l formed on the lower periphery of the sector bosses 11.

The electric motor 15 for driving the sander is preferably formed a casing integral with the portions 11, and the motor shaft 15 has mounted 9 thereon a suction fan l'l. In order that the discharge from the fan will be directly into the discharge opening 18, the fan blades are of the shape indicated at 19 in Figure 8, and a disc support 20 is provided to take up the clearance between the fan blades and the surface 21 of the casing 15.

The sanding disc 22 as indicated in Figure 10, is secured on the end of the spindle 16 as by means of a screw 23. I have provided a cover 00 plate 24 which is secured to the casing 15 by means of registered tapped holes 25 and tapped holes 26 in the casing 15 through which mounting bolts may be secured in the usual manner.

The discharge passage 18 is formed as an integral part of the cover plate 24: and the opening into the passage 18 is from the periphery of an annular recess 26 into which the fan 1''! fits.

The sanding disc 22 is circular in shape, and

, conduit.

in order to provide openings through which dust may pass from the face of the sanding disc back to the fan, the cover plate has eccentric or tangential portions 27 which provide openings 28 for the intake of air.

In back of the sanding disc I have mounted a resistance plate 29 which has a felt washer 30 which seats against the hub 31 of the sanding disc and the cover 24 has a rib 32 which fills in the space within the cover between the resistance plate and the inner surface of the cover. Dust from the surface of the disc passes through the eccentric or tangential openings 28 and the cover has recessed portions 33 which permit air and dust to be drawn into the fan chamber 26 from whence it is discharged through the passage 18.

The casing 1 has slide supports 34 for the work table 35, and in order to provide a gauge for the table, a dovetail slot 36 extends laterally across the table. Within the slot 36 there is a sliding member 37 which permits the movement of the gauge laterally across the table. The gaugeis pivotally mounted at 38 in the slide bar 37. The gauge consists of a bracket 39 having an arcuate slot 40 therein which permits the bracket to be swivelled about the pivot point 38 and secured in desired position of adjustment by means of the thumb nut 41. Fixedly mounted on the bracket 39 I have provided a plate 42 having a slot 43 therein which retains the shank 44 of a thumb nut 45. The plate 42 has a slot 46 therein which seats a rib 47 of the gauge plate 48.

To set the sanding disc at a desired angle relative to the work table, the hand wheel 8 is rotated to cause the motor casing to swivel in the arcuate guide grooves 13 of the members 10. To indicate the precise adjustment of this swiveling operation I have secured a sector gauge plate 49 having calibrations 50, to indicate degrees of inclination of the motor and sanding disc assembly on the casing 1. As noted, the sector plate is provided with one of the guiding grooves 13, the other being formed in the member 10. The calibrations indicate the movement of the gear sectors 14.

To set the table gauge for a desired position so that the angle at which work is brought into contact with the sanding disc may be controlled, various positions of angular adjustment may be provided by loosening the thumb nut 41 and swiveling the bracket 39 about the pivot 38. Then by releasing the thumb nut the guide bar 48 may be moved to the left as indicated in Figure 12 in case the sanding disc as indicated in Figure 1 is inclined away from the table or to the right as indicated in Figure 12, in case the sanding disc is inclined towards the table.

The guard 24 will preferably have an apron 51 which partially covers the face of the sanding disc. The apron or guard 51 is preferably pivoted at 51a, so that it may be swung up out f the way if it interferes with the application of work to the sanding disc. There is also a lower cover plate 52. Any abrasive material, as has been noted, passes through the openings 28 into the fan chamber from which it is discharged through the passage 13 to some desirable The resistance plate 29 prevents the counter suction being formed by the inner surface of the sanding disc, so that dust is freely carried away.

In Figure 13 I have shown a modified type of support in which the arcuate segments lla are formed in an integral casting with guide channels 111), which slidably retain the tracks 52 of a sector supporting plate 53. The channels 111) have slots 54 through which adjustment bolts 55 extend, which may be tightened down to hold the motor in a desired position of vertical adjustment.

I-Iavim thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A sanding machine having a relatively fixed work table and an electric motor having a rotatable sanding disc mounted on the shaft of said motor, said sanding disc, motor and motor shaft having their axis at right angles to an edge of said table and adjustable as a unit to various angles of inclination relative to said table, and a table gauge adjustable to various angular positions relative to said disc.

2. A sanding machine having a relatively fixed work table and an electric motor having a rotatable sanding disc mounted on the shaft of said motor, said sanding disc, motor and motor shaft having their axis at right angles to an edge of said table and adjustable as a unit to various angles of inclination relative to said table, and a table gauge adjustable to various angular positions relative to said disc, said gauge adjustable in the plane of said table substantially parallel with said edge.

3. A sanding machine having a relatively fixed work table and an electric motor having a rotatable sanding disc mounted on the shaft of said motor, said sanding disc, motor and motor shaft having their axis at right angles to an edge of said table and adjustable as a unit to various angles of inclination relative to said table, and a table gauge adjustable to various angular positions relative to said disc, said table gauge extendible to accommodate the angle of inclination of said disc.

4. In a disc sanding machine, a direct connected sanding disc and motor, a base having a throat admitting said sanding disc, adjusting means fitting said base under and around said throat and extending up and adjustably support-' ing said sanding disc and motor, and a work table mounted on said base for adjustment toward and away from said sanding disc, and overhanging said adjusting means.

5. In a disc sanding machine, a direct con porting said sanding disc and motor, and a work" table mounted on said base for adjustment toward and away from said sanding disc, and overhanging said adjusting means, a hood around said disc, and a dust-discharge conduit leading out through said throat.

6. In a disc sanding machine, a direct connected sanding disc and motor, a base having a threat admitting said sanding disc, adjusting means fitting said base under and around said throat and extending up and adjustably supporting said sanding disc and motor, comprising a toothed segment, and gear means meshing with said segment, and a work table mounted on said base for adjustment toward and away from said sanding disc, and overhanging said adjusting means.

7. In a disc sanding machine, a direct connected sanding disc, fan, and motor, a base having a throat admitting said sanding disc, adjusting means fitting said base under and around said throat and extending up and adjustably supporting said sanding disc and motor, a hood around said disc and fan, having inner passages to said fan, and a work table mounted on said base for adjustment toward and away from said sanding disc, and overhanging said adjusting means.

8. In a disc sanding machine, a direct connected sanding disc and motor, a base having a throat admitting said sanding disc, adjusting means fitting said base under and around said throat and extending up and adjustably support- 

